Temperature control system

Abstract

The invention discloses a temperature control system. The temperature control system comprises a circulation tank, at least one load, a compressor, a condenser and an expansion valve. The circulating tank comprises a first liquid inlet, a first liquid outlet, a second air inlet and a second air outlet, and the first liquid outlet is formed in the bottom of the circulating tank; the circulating tank is used for storing a refrigerant; the load comprises an inlet and an outlet; the inlet is communicated with the first liquid outlet, and the outlet is communicated with the second air inlet; the compressor comprises an air inlet and an air outlet; the air inlet is communicated with the second air outlet; the condenser comprises a condensation inlet and a condensation outlet, and the condensation inlet is communicated with the exhaust port; the expansion valve communicates with the condensation outlet and the first liquid inlet. According to the technical scheme, the cooling consistency and cooling uniformity of the temperature control system on the load can be improved, and then the cooling effect of the temperature control system on the load is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of temperature control, and in particular to a temperature control system. Background Art

[0002] The temperature control system is usually composed of a compressor, a condenser, an evaporator, an expansion valve and an evaporator. The temperature control system is widely used in equipment such as air conditioners or refrigerators. Since the components in some industrial equipment generate heat during operation, the heat generated will affect the operation of the components. Therefore, it is necessary to adjust the operating temperature of the components to prevent the high temperature of the components from affecting the working performance of the components.

[0003] In the prior art, the above-mentioned device is used as an evaporator in the temperature control system to form a direct cooling system for directly adjusting the temperature of the device. However, the liquid outlet of the expansion valve in this system is directly connected to the device, and when the refrigerant passes through the expansion valve, due to the sudden drop in pressure, some molecules inside the refrigerant liquid obtain sufficient energy and are quickly converted into a gas state, so that the refrigerant entering the device includes gas and liquid, resulting in inconsistent cooling effect of the refrigerant on the surface of the device, thereby affecting the uniformity and reliability of the control of the device temperature. Summary of the invention

[0004] The present invention provides a temperature control system, which can improve the cooling consistency and uniformity of the temperature control system on a load, thereby improving the cooling effect of the temperature control system on the load.

[0005] The present invention provides a temperature control system, comprising:

[0006] A circulation tank, comprising a first liquid inlet, a first liquid outlet, a second air inlet and a second air outlet, wherein the first liquid outlet is located at the bottom of the circulation tank; the circulation tank is used to store refrigerant;

[0007] at least one load, comprising an inlet and an outlet; the inlet is in communication with the first liquid outlet, and the outlet is in communication with the second air inlet;

[0008] A compressor, comprising an air inlet and an air outlet; the air inlet is connected to the second air outlet;

[0009] A condenser, comprising a condensation inlet and a condensation outlet, wherein the condensation inlet is connected to the exhaust port;

[0010] An expansion valve is connected to the condensation outlet and the first liquid inlet respectively.

[0011] Optionally, the temperature control system also includes:

[0012] A pressure detection device is located in the circulation tank; the pressure detection device is used to obtain a first pressure of the refrigerant located in the circulation tank;

[0013] A controller is electrically connected to the pressure detection device, the compressor and the expansion valve respectively; the controller is used to determine the set pressure in the circulation tank according to the required cooling temperature of each load; determine the required frequency of the compressor according to the first pressure and the set pressure, or determine the required opening of the expansion valve, and control the compressor to operate at the required frequency, or control the expansion valve to be at the required opening.

[0014] Optionally, the controller is specifically configured as:

[0015] The minimum value among the required cooling temperatures is used as the set temperature;

[0016] According to the mapping relationship between temperature and pressure, the pressure corresponding to the set temperature is used as the set pressure.

[0017] Optionally, the controller is specifically configured as:

[0018] Determine, according to the first pressure and the set pressure, a pressure difference between the first pressure and the set pressure and an absolute value of the pressure difference;

[0019] Determining whether the absolute value of the pressure difference is greater than a preset pressure difference;

[0020] If so, a first required frequency of the compressor is determined according to the pressure difference and the current operating frequency of the compressor, and the compressor is controlled to operate at the first required frequency.

[0021] Optionally, if the absolute value of the pressure difference is less than or equal to the preset pressure difference, the required opening of the expansion valve is determined based on the pressure difference and the current opening of the expansion valve, and the expansion valve is controlled to be at the required opening.

[0022] Optionally, the temperature control system also includes:

[0023] At least one electrically controlled valve is arranged corresponding to each of the loads, and each of the electrically controlled valves is respectively connected to an inlet of each of the loads;

[0024] At least one temperature detection device is provided in one-to-one correspondence with each of the loads, and the temperature detection device is used to obtain the current temperature of the load;

[0025] The controller is also electrically connected to the electric control valve and each of the temperature detection devices. The controller is also used to control the opening of the electric control valve according to the current temperature to adjust the refrigerant flow entering the load.

[0026] Optionally, the controller is configured as:

[0027] According to the current temperature and the preset temperature, determining a temperature difference between the current temperature and the preset temperature and an absolute value of the temperature difference;

[0028] Determine whether the absolute value of the temperature difference is greater than a preset temperature difference;

[0029] If so, the required operating opening of the electric control valve is determined according to the temperature difference and the current operating opening of the electric control valve, and the electric control valve is controlled to operate at the required operating opening.

[0030] Optionally, the temperature control system also includes:

[0031] A liquid pump, located between the first liquid outlet and each of the inlets;

[0032] The controller is also electrically connected to the liquid pump. The controller is also used to return to the step of determining the temperature difference between the current temperature and the preset temperature and the absolute value of the temperature difference based on the current temperature and the preset temperature after controlling the electric control valve to operate at the required operating opening for a preset time, to determine whether the absolute value of the temperature difference is greater than the preset temperature difference. If the absolute value of the temperature difference is greater than the preset temperature, the required frequency of the liquid pump is determined based on the temperature difference and the current frequency of the liquid pump, and the liquid pump is controlled to operate at the required frequency.

[0033] Optionally, the temperature control system also includes:

[0034] a flow meter located between the liquid pump and each of the inlets;

[0035] a bypass valve, located between the liquid pump and the second liquid inlet;

[0036] The controller is also electrically connected to the flow meter and the bypass valve, and the controller is also used to control the working state of the bypass valve according to the current flow obtained by the flow meter.

[0037] Optionally, the temperature control system also includes:

[0038] A filter is located between the condenser and the expansion valve.

[0039] The technical solution provided by the present invention is to set a circulation tank in the temperature control system, set the expansion valve at the first liquid inlet of the circulation tank, so that the gas refrigerant and liquid refrigerant provided by the expansion valve can be separated into gas and liquid in the circulation tank, the liquid refrigerant is located at the bottom of the circulation tank, and the gas refrigerant is located at the top of the circulation tank. The first liquid outlet connected to the inlet of the load is located at the bottom of the circulation tank to ensure that the refrigerant provided to the load is liquid, improve the cooling consistency and uniformity of the refrigerant on the load, and thus improve the cooling effect of the temperature control system on the load. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of a temperature control system provided by an embodiment of the present invention;

[0041] Figure 2 A schematic diagram of the structure of another temperature control system provided by an embodiment of the present invention;

[0042] Figure 3 A schematic diagram of the structure of another temperature control system provided by an embodiment of the present invention;

[0043] Figure 4 A schematic diagram of the structure of another temperature control system provided by an embodiment of the present invention;

[0044] Figure 5 A schematic diagram of the structure of a temperature control system provided by an embodiment of the present invention;

[0045] Figure 6 A schematic diagram of the structure of another temperature control system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0046] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0047] Figure 1 A schematic diagram of a temperature control system provided by an embodiment of the present invention is shown in FIG. Figure 1As shown, the temperature control system includes a circulation tank 10, at least one load 20, a compressor 30, a condenser 40 and an expansion valve 50. The circulation tank 10 includes a first liquid inlet A1, a first liquid outlet B1, a first air inlet A2 and a first air outlet B2, and the first liquid outlet B1 is located at the bottom of the circulation tank 10; the circulation tank 10 is used to store refrigerant. At least one load 20, the load 20 includes an inlet and an outlet, the inlet is connected to the first liquid outlet B1, and the outlet is connected to the first air inlet A2. The compressor 30 includes an air inlet and an exhaust port, and the air inlet is connected to the first air outlet B2. The condenser 40 includes a condensation inlet and a condensation outlet, and the condensation inlet is connected to the exhaust port. The expansion valve 50 is connected to the condensation outlet and the first liquid inlet A1 respectively.

[0048] The load 20 may include a cooling pipeline connecting the inlet and the outlet, and the cooling pipeline may surround the heating part of the load 20, so that when the refrigerant passes through the cooling pipeline in the load 20, it can exchange heat with the heating part in the load 20 to reduce the temperature of the load 20. The load 20 can be set according to actual needs. For example, the load includes semiconductor chips, etc., and can also be other, which is not specifically limited here. The refrigerant includes Freon, etc., the circulation tank 10 includes materials such as stainless steel or alloy, and the expansion valve 50 includes an electromagnetic electronic expansion valve or an electric electronic expansion valve, etc.

[0049] Specifically, the refrigerant in the circulation tank 10 enters the compressor 30 through the first gas outlet B2, and the compressor 30 converts the low-temperature and low-pressure refrigerant gas into a high-temperature and high-pressure refrigerant gas. The high-temperature and high-pressure refrigerant gas is cooled in the condenser 40 to form a low-temperature and medium-pressure refrigerant liquid, which becomes a low-temperature and low-pressure refrigerant liquid after throttling and depressurization by the expansion valve 50. The low-temperature and low-pressure refrigerant liquid enters the circulation tank 10 and enters each load 20 through the first liquid outlet B1. The low-temperature and low-pressure refrigerant is subjected to heat absorption and evaporation in the load 20 and then outputs a low-temperature and low-pressure refrigerant gas. The low-temperature and low-pressure refrigerant gas enters the circulation tank 10 through the first gas inlet A2. In this way, the above process is repeated to achieve cooling of the load 20. By setting the circulation tank 10, the expansion valve 50 is set at the first liquid inlet A1 of the circulation tank 10, and the gas refrigerant and liquid refrigerant provided by the expansion valve 50 can be separated into gas and liquid in the circulation tank 10, and the liquid refrigerant is located at the bottom of the circulation tank 10, and the gas refrigerant is located at the top of the circulation tank 10. The first liquid outlet B1 is located at the bottom of the circulation tank 10 to ensure that the refrigerant provided to the load 20 is liquid, thereby improving the cooling consistency and uniformity of the refrigerant on the load 20 and further improving the cooling effect on the load 20 .

[0050] The technical solution of the embodiment of the present invention is to set a circulation tank in the temperature control system, set the expansion valve at the first liquid inlet of the circulation tank, so that the gas refrigerant and liquid refrigerant provided by the expansion valve can be separated into gas and liquid in the circulation tank, the liquid refrigerant is located at the bottom of the circulation tank, and the gas refrigerant is located at the top of the circulation tank. The first liquid outlet connected to the inlet of the load is located at the bottom of the circulation tank to ensure that the refrigerant provided to the load is liquid, improve the cooling consistency and uniformity of the refrigerant on the load, and then improve the cooling effect of the temperature control system on the load.

[0051] Optional, Figure 2 A schematic diagram of another temperature control system provided by an embodiment of the present invention is shown in FIG. Figure 2 As shown, the temperature control system further includes a pressure detection device PT and a controller 60. The pressure detection device PT is located in the circulation tank 10; the pressure detection device PT is used to obtain the first pressure of the refrigerant in the circulation tank 10. The controller 60 is electrically connected to the pressure detection device PT, the compressor 30 and the expansion valve 50 respectively; the controller 60 is used to determine the set pressure in the circulation tank 10 according to the required cooling temperature of each load 20; determine the required frequency of the compressor 30 according to the first pressure and the set pressure, or determine the required opening of the expansion valve 50, and control the compressor 30 to operate at the required frequency, or control the expansion valve 50 to be at the required opening.

[0052] The pressure detection device PT includes a piezoresistive pressure sensor, a capacitive pressure sensor or a piezoelectric pressure sensor, etc., and can be configured according to actual needs, which is not specifically limited here.

[0053] Specifically, the required cooling temperatures of the loads 20 may be the same or different. When the operating temperature of the load 20 is high, the refrigerant with the required cooling temperature has a higher cooling efficiency for the load 20. The required cooling temperature can be set according to the actual working requirements of the load 20, and is not specifically limited here. When the required cooling temperatures of the loads 20 are the same, the required cooling temperature can be used as the set temperature of the circulation tank 10. The temperature of the refrigerant in the circulation tank 10 is proportional to the pressure, that is, the greater the pressure of the refrigerant, the greater the temperature of the refrigerant. The set pressure corresponding to the set temperature can be determined based on the corresponding relationship between the temperature and pressure of the refrigerant. The controller 60 obtains the first pressure of the refrigerant in the circulation tank 10 in real time through the pressure detection device PT, compares the first pressure with the set pressure, and adjusts the operating frequency of the compressor 30 or the opening of the expansion valve 50 according to the relationship between the first pressure and the set pressure, so that the first pressure is close to or equal to the set pressure, so that the temperature of the refrigerant in the circulation tank 10 is close to or equal to the required cooling temperature of the load 20, so as to meet the cooling demand of the load 20, improve the cooling efficiency of the refrigerant on the load 20, and prevent the refrigerant temperature from being too high, resulting in the inability to reduce the operating temperature of the load 20 in time.

[0054] Optionally, the controller 60 is specifically configured to: use the minimum value of each required cooling temperature as the set temperature; and use the pressure corresponding to the set temperature as the set pressure according to the mapping relationship between temperature and pressure.

[0055] Specifically, the required cooling temperatures of each load 20 may be the same or different. When there are at least two loads 20 with different required cooling temperatures among the loads 20, the minimum value of each required cooling temperature can be used as the set temperature to ensure the cooling reliability of each load 20. The mapping relationship can be a temperature and pressure curve graph or a temperature and pressure correspondence table, etc., which can be obtained through experiments or experience. When the mapping relationship is a temperature and pressure curve graph, after obtaining the set temperature, the temperature and pressure curve graph can be directly compared to determine the pressure on the curve graph corresponding to the set temperature as the set pressure. Alternatively, when the mapping relationship is a temperature and pressure correspondence table, after obtaining the set temperature, the pressure corresponding to the set temperature can be directly looked up in the table and determined as the set pressure.

[0056] It can be understood that the demand frequency of the compressor, or the demand opening of the expansion valve is related to the relationship between the first pressure and the set pressure. In an optional embodiment, the controller 60 is specifically configured to: determine the pressure difference between the first pressure and the set pressure and the absolute value of the pressure difference based on the first pressure and the set pressure; determine whether the absolute value of the pressure difference is greater than the preset pressure difference; if so, determine the first demand frequency of the compressor 30 based on the pressure difference and the current operating frequency of the compressor 30, and control the compressor 30 to operate at the first demand frequency.

[0057] The preset pressure difference may be a fixed value or a non-fixed value, and may be determined according to actual control needs. The preset pressure difference may range from 0 kpa to 70 kpa. For example, the preset pressure difference may be 50 kpa. The pressure difference value includes positive and negative numbers.

[0058] Specifically, the absolute value of the pressure difference indicates the degree of difference between the first pressure and the set pressure. The greater the absolute value of the pressure difference, the greater the degree of difference between the first pressure and the set pressure. The smaller the absolute value of the pressure difference, the smaller the degree of difference between the first pressure and the set pressure. If the absolute value of the pressure difference is greater than the preset pressure difference, it means that the difference between the first pressure and the set pressure is large, and it is not enough to adjust the difference by adjusting the opening of the expansion valve 50 alone. Therefore, it is necessary to adjust the operating frequency of the compressor 30 to reduce the difference between the first pressure and the set pressure. When the absolute value of the pressure difference is greater than the preset pressure difference, the controller 60 can determine whether the pressure difference is greater than zero. If the pressure difference is greater than zero, it means that the first pressure is much greater than the set pressure. Based on the PID control algorithm, the first demand frequency can be determined according to the current operating frequency and the pressure difference. The first demand frequency is greater than the current operating frequency, so that after the compressor operates at the first demand frequency, the refrigerant pressure provided to the circulation tank 10 can be reduced, thereby making the first pressure close to or reach the set pressure. In this way, when the first pressure is greatly different from the set pressure, the first pressure of the refrigerant in the circulation tank 10 can be quickly adjusted by adjusting the operating frequency of the compressor 30, thereby improving the pressure control efficiency.

[0059] Accordingly, when the absolute value of the pressure difference is greater than the preset pressure difference, the controller 60 can determine whether the pressure difference is greater than zero. If the pressure difference is less than zero, it means that the first pressure is much less than the set pressure. The first demand frequency can be determined based on the current operating frequency and the pressure difference based on the PID control algorithm. The first demand frequency is less than the current operating frequency, so that after the compressor operates at the first demand frequency, the pressure of the refrigerant provided to the circulation tank 10 can be increased, thereby making the first pressure close to or reach the set pressure. In this way, when the difference between the first pressure and the set pressure is large, the operating frequency of the compressor 30 can be adjusted to quickly adjust the first pressure of the refrigerant in the circulation tank 10, thereby improving the pressure control efficiency.

[0060] The above describes the case where the absolute value of the pressure difference is greater than the preset pressure difference. Optionally, if the absolute value of the pressure difference is less than or equal to the preset pressure difference, the required opening of the expansion valve 50 is determined based on the pressure difference and the current opening of the expansion valve 50, and the expansion valve 50 is controlled to be at the required opening.

[0061] Specifically, if the absolute value of the pressure difference is less than or equal to the preset pressure difference, it means that the difference between the first pressure and the set pressure is small. If the operating frequency of the compressor 30 is still adjusted, the difference between the first pressure and the set pressure may increase. Therefore, at this time, only the opening of the expansion valve 50 needs to be adjusted to further reduce the difference between the first pressure and the set pressure. When the absolute value of the pressure difference is less than or equal to the preset pressure difference, the controller 60 can determine whether the pressure difference is greater than zero. If the pressure difference is greater than zero, it means that the first pressure is greater than the set pressure. The required opening can be determined based on the PID control algorithm according to the current opening and the pressure difference. The required opening is less than the current opening, so that when the expansion valve 50 is at the required opening, the refrigerant pressure provided to the circulation tank 10 can be reduced, thereby making the first pressure close to or reach the set pressure. In this way, when the difference between the first pressure and the set pressure is small, the opening of the expansion valve 50 can be adjusted to achieve fine adjustment of the first pressure of the refrigerant in the circulation tank 10, thereby improving the pressure adjustment accuracy.

[0062] Optional, Figure 3 A schematic diagram of a temperature control system according to an embodiment of the present invention is shown in FIG. Figure 3 As shown, the temperature control system also includes at least one electrically controlled valve 70 corresponding to each load 20, and at least one temperature detection device 21 corresponding to each load 20, each electrically controlled valve 70 is connected to the inlet of each load 20 respectively; the temperature detection device 21 is used to obtain the current temperature of the load 20; the controller 60 is also electrically connected to the electrically controlled valve 70 and each temperature detection device 21, and the controller 60 is also used to control the opening of the electrically controlled valve 70 according to the current temperature to adjust the refrigerant flow entering the load 20.

[0063] The temperature detection device 21 includes a thermocouple sensor, a thermistor sensor, a platinum resistance sensor or an integrated temperature sensor, etc., and can be configured according to actual needs, which is not specifically limited here.

[0064] Specifically, the controller 60 stores the preset temperature of each load 20. When the load 20 is at the preset temperature, the load 20 has better working performance and working reliability. The controller 60 obtains the current temperature of each load 20 through the temperature detection device 21, and controls the opening of the electric control valve 70 by comparing the current temperature with the preset temperature to adjust the refrigerant flow entering the load 20, thereby improving the timeliness and reliability of the temperature adjustment of the load 20. For example, if the current temperature is greater than the preset temperature, the opening of the electric control valve 70 can be increased to increase the refrigerant flow through the load 20 and reduce the temperature of the load 20.

[0065] Optionally, the controller 60 is configured to: determine the temperature difference between the current temperature and the preset temperature and the absolute value of the temperature difference based on the current temperature and the preset temperature; determine whether the absolute value of the temperature difference is greater than the preset temperature difference; if so, determine the required operating opening of the electric control valve 70 based on the temperature difference and the current operating opening of the electric control valve, and control the electric control valve 70 to operate at the required operating opening.

[0066] Among them, the preset temperature and the preset temperature difference can be fixed values ​​or non-fixed values, and can be set according to actual needs, and are not specifically limited here.

[0067] Specifically, the absolute value of the temperature difference indicates the degree of difference between the current temperature and the preset temperature. The larger the absolute value of the temperature difference, the larger the degree of difference between the current temperature and the preset temperature. The smaller the absolute value of the temperature difference, the smaller the degree of difference between the current temperature and the preset temperature. If the absolute value of the temperature difference is greater than the preset pressure difference, it means that the degree of difference between the current temperature and the preset temperature is large. At this time, the controller 60 can continue to determine whether the temperature difference is greater than zero. If the temperature difference is greater than zero, it means that the current temperature is greater than the preset temperature. The temperature difference and the current operation opening can be substituted into the calculation formula of the required operation opening to determine the required operation opening, or the required operation opening can be determined based on the corresponding table of the temperature difference, the current operation opening and the required operation opening. The required operation opening is greater than the current operation opening, so that after the electric control valve 70 operates at the required operation opening, the refrigerant flow provided to the load 20 can be increased, the heat exchange efficiency between the refrigerant and the load 20 can be improved, and the current temperature of the load 20 can be close to or equal to the preset temperature faster, thereby improving the temperature adjustment efficiency and temperature adjustment reliability of the load 20.

[0068] Correspondingly, when the absolute value of the temperature difference is greater than the preset pressure difference, the controller 60 can determine whether the temperature difference is greater than zero. If the temperature difference is less than zero, it means that the current temperature is less than the preset temperature. The temperature difference and the current operating opening can be substituted into the calculation formula of the required operating opening to determine the required operating opening, or the required operating opening can be determined based on the corresponding table of the temperature difference, the current operating opening and the required operating opening. The required operating opening is less than the current operating opening, so that after the electric control valve 70 operates at the required operating opening, the refrigerant flow provided to the load 20 can be reduced, and the heat exchange efficiency between the refrigerant and the load 20 can be reduced, so that the current temperature of the load 20 can approach or be equal to the preset temperature faster, thereby improving the temperature adjustment efficiency and temperature adjustment reliability of the load 20.

[0069] Optional, Figure 4 A schematic diagram of a temperature control system according to an embodiment of the present invention is shown in FIG. Figure 4As shown, the temperature control system also includes a liquid pump 80. The liquid pump 80 is located between the first liquid outlet B1 and each inlet. The controller 60 is also electrically connected to the liquid pump 80. The controller 60 is also used to return to the step of determining the temperature difference between the current temperature and the preset temperature and the absolute value of the temperature difference according to the current temperature and the preset temperature, and determining whether the absolute value of the temperature difference is greater than the preset temperature difference, after controlling the electric control valve 70 to operate at the required operating opening for a preset time, and if the absolute value of the temperature difference is greater than the preset temperature, the required frequency of the liquid pump 80 is determined according to the temperature difference and the current frequency of the liquid pump 80, and the liquid pump 80 is controlled to operate at the required frequency.

[0070] The liquid pump 80 includes a centrifugal pump, etc. The preset time may be a fixed value. For example, the preset time is 5 minutes, and may be other values, which are not specifically limited here.

[0071] Specifically, after controlling the electric control valve 70 to operate at the required opening for a preset time, if the absolute value of the temperature difference between the current temperature of the load 20 and the preset temperature is still greater than the preset temperature difference, it means that the opening of the electric control valve 70 has little effect on the temperature adjustment of the load 20. At this time, the temperature difference and the current frequency of the liquid pump 80 can be substituted into the calculation formula of the required frequency to determine the required frequency at which the refrigerant flow rate can be increased or decreased, so that after controlling the liquid pump 80 to operate at the required frequency, the refrigerant flow rate flowing through the load 20 can be rapidly increased or decreased, thereby improving the temperature adjustment efficiency and temperature adjustment reliability of the load 20. After controlling the electric control valve 70 to operate at the required operating opening for a preset time, if the absolute value of the temperature difference between the current temperature of the load 20 and the preset temperature is still greater than the preset temperature difference, the controller 60 continues to determine whether the temperature difference is greater than zero. If the temperature difference is greater than zero, it means that the refrigerant flow through the load 20 is small, and the required frequency determined according to the temperature difference and the current frequency is greater than the current frequency. After the liquid pump 80 operates at the required frequency, the refrigerant flow through the load 20 can be quickly increased, thereby improving the cooling efficiency of the load 20.

[0072] Optional, Figure 5 A schematic diagram of a temperature control system provided by an embodiment of the present invention is shown in FIG. Figure 5 As shown, the temperature control system further includes a flow meter 91 and a bypass valve 92. The flow meter 91 is located between the liquid pump 80 and each inlet; the bypass valve 92 is located between the liquid pump 80 and the second liquid inlet A2. The controller 60 is also electrically connected to the flow meter 91 and the bypass valve 92. The controller 60 is also used to control the working state of the bypass valve 92 according to the current flow obtained by the flow meter 91.

[0073] The flow meter 91 includes a differential pressure flow meter, a rotor flow meter, a throttling flow meter or an electromagnetic flow meter, etc., and can be set according to actual needs, and is not specifically limited here.

[0074] Specifically, the bypass valve 92 is usually in a closed state, and the flow meter 91 can obtain the refrigerant flow provided by the liquid pump 80 to the load 20 in real time. The controller 60 stores the flow lower limit value of the liquid pump 80 and the frequency lower limit value corresponding to the flow lower limit value. If the demand frequency determined according to the temperature difference and the current frequency is less than the frequency lower limit value, the flow corresponding to the demand frequency can be used as the set flow, and the current flow difference between the current flow obtained by the flow meter 91 and the set flow is calculated. According to the corresponding relationship between the flow difference and the bypass valve opening, the bypass valve opening corresponding to the current flow difference is used as the working opening of the bypass valve 92, and the bypass valve 92 is controlled to operate at the working opening, so that a part of the refrigerant provided by the liquid pump 80 returns to the circulation tank 10 through the bypass valve 92, and the other part flows through the load 20, thereby improving the adjustment accuracy of the refrigerant flow flowing through the load 20, thereby improving the temperature control accuracy and reliability of the load 20.

[0075] Optional, Figure 6 A schematic diagram of another temperature control system provided by an embodiment of the present invention is shown in FIG. Figure 6 As shown, the temperature control system further includes a filter 93 located between the condenser 40 and the expansion valve 50 .

[0076] Specifically, the filter 93 is used to filter impurities in the refrigerant, improve the cleanliness of the refrigerant flowing through the expansion valve 50, prevent problems such as clogging of the expansion valve 50, and improve the circulation stability of the refrigerant in the temperature control system.

[0077] Optional, continue to refer to Figure 6 The temperature control system further includes an oil separator 94, an oil cooler 95 and an oil return solenoid valve 96. The oil separator 94 is located between the compressor 30 and the condenser 40. The oil outlet of the oil separator 94 is connected to the compressor 30, and the refrigerant outlet of the oil separator 94 is connected to the condenser 40. The oil separator 94 is used to separate the lubricating oil in the refrigerant and provide the separated lubricating oil to the compressor 30 to lubricate the components in the compressor 30, etc., and at the same time improve the cleanliness of the refrigerant provided to the condenser 40. The oil cooler 95 includes a refrigerant inlet, a refrigerant outlet, a lubricating oil inlet and a lubricating oil outlet; the refrigerant inlet is connected to the condensation outlet of the condenser, the refrigerant outlet is connected to the inlet of the filter 93, the lubricating oil inlet is connected to the oil return solenoid valve 96, the lubricating oil outlet is connected to the compressor 30, and the other end of the oil return solenoid valve 96 is connected to the circulation tank 10. The oil return solenoid valve 96 is used to provide the lubricating oil separated in the circulation tank 10 to the oil cooler 95, and return to the compressor 30 after being cooled by the oil cooler 95.

[0078] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, combinations and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A temperature control system, characterized in that: include: A circulation tank, comprising a first liquid inlet, a first liquid outlet, a second air inlet and a second air outlet, wherein the first liquid outlet is located at the bottom of the circulation tank; The circulation tank is used to store refrigerant; at least one load, comprising an inlet and an outlet; the inlet is in communication with the first liquid outlet, and the outlet is in communication with the second air inlet; A compressor, comprising an air inlet and an air outlet; the air inlet is connected to the second air outlet; A condenser, comprising a condensation inlet and a condensation outlet, wherein the condensation inlet is connected to the exhaust port; An expansion valve is connected to the condensation outlet and the first liquid inlet respectively.

2. The temperature control system according to claim 1, characterized in that: Also includes: A pressure detection device, located in the circulation tank; The pressure detection device is used to obtain a first pressure of the refrigerant in the circulation tank; A controller is electrically connected to the pressure detection device, the compressor and the expansion valve respectively; the controller is used to determine the set pressure in the circulation tank according to the required cooling temperature of each load; determine the required frequency of the compressor according to the first pressure and the set pressure, or determine the required opening of the expansion valve, and control the compressor to operate at the required frequency, or control the expansion valve to be at the required opening.

3. The temperature control system according to claim 2, characterized in that: The controller is specifically configured as follows: The minimum value among the required cooling temperatures is used as the set temperature; According to the mapping relationship between temperature and pressure, the pressure corresponding to the set temperature is used as the set pressure.

4. The temperature control system according to claim 2, characterized in that: The controller is specifically configured as follows: Determine, according to the first pressure and the set pressure, a pressure difference between the first pressure and the set pressure and an absolute value of the pressure difference; Determining whether the absolute value of the pressure difference is greater than a preset pressure difference; If so, a first required frequency of the compressor is determined according to the pressure difference and the current operating frequency of the compressor, and the compressor is controlled to operate at the first required frequency.

5. The temperature control system according to claim 4, characterized in that: If the absolute value of the pressure difference is less than or equal to the preset pressure difference, the required opening of the expansion valve is determined according to the pressure difference and the current opening of the expansion valve, and the expansion valve is controlled to be at the required opening.

6. The temperature control system according to claim 2, characterized in that: Also includes: At least one electrically controlled valve is arranged corresponding to each of the loads, and each of the electrically controlled valves is respectively connected to an inlet of each of the loads; At least one temperature detection device is provided in one-to-one correspondence with each of the loads, and the temperature detection device is used to obtain the current temperature of the load; The controller is also electrically connected to the electric control valve and each of the temperature detection devices. The controller is also used to control the opening of the electric control valve according to the current temperature to adjust the refrigerant flow entering the load.

7. The temperature control system according to claim 6, characterized in that: The controller is configured to: According to the current temperature and the preset temperature, determining a temperature difference between the current temperature and the preset temperature and an absolute value of the temperature difference; Determine whether the absolute value of the temperature difference is greater than a preset temperature difference; If so, the required operating opening of the electric control valve is determined according to the temperature difference and the current operating opening of the electric control valve, and the electric control valve is controlled to operate at the required operating opening.

8. The temperature control system according to claim 7, characterized in that: Also includes: A liquid pump, located between the first liquid outlet and each of the inlets; The controller is also electrically connected to the liquid pump. The controller is also used to return to the step of determining the temperature difference between the current temperature and the preset temperature and the absolute value of the temperature difference based on the current temperature and the preset temperature after controlling the electric control valve to operate at the required operating opening for a preset time, to determine whether the absolute value of the temperature difference is greater than the preset temperature difference. If the absolute value of the temperature difference is greater than the preset temperature, the required frequency of the liquid pump is determined based on the temperature difference and the current frequency of the liquid pump, and the liquid pump is controlled to operate at the required frequency.

9. The temperature control system according to claim 8, characterized in that: Also includes: a flow meter located between the liquid pump and each of the inlets; a bypass valve, located between the liquid pump and the second liquid inlet; The controller is also electrically connected to the flow meter and the bypass valve, and the controller is also used to control the working state of the bypass valve according to the current flow obtained by the flow meter.

10. The temperature control system according to claim 1, characterized in that: Also includes: A filter is located between the condenser and the expansion valve.

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